For those heralding UAVs as the future, there were discussions in the intel community quite a while ago about their vulnerabilities. I don't see a future in UAVs due to those vulnerabilities.
Interesting article: Iran's Alleged Drone Hack: Tough, but Possible | Danger Room | Wired.com

I doubt that the Iranians did this independently; they almost certainly had help from a more cyber-savvy country.